import numpy as np
v1 = np.array([[1,2],[3,4]])
v2 = np.array([[5,6],[7,8]])

ret = np.dot(v1,v2)
print(f"点积: {ret}")
'''
1 2  x 5 6
3 4    7 8

[1*5 + 2*7, 1*6 + 2*8]
[3*5 + 4*7, 3*6 + 4*8]

[[19 22]
 [43 50]]
'''
